/Engine/Source/Editor/UnrealEd/Public/Subsystems/EditorActorSubsystem.h
Duplicate an actor from the world editor.
The duplicated actor, or none if it didn't succeed
[AActor](API\Runtime\Engine\GameFramework\AActor) * DuplicateActor ( [AActor](API\Runtime\Engine\GameFramework\AActor) * ActorToDuplicate, [UWorld](API\Runtime\Engine\Engine\UWorld) * ToWorld, FVector Offset )